Oyster case and Ringlock system
A paragon of robustness and reliability, the 44 mm Oyster case of the Rolex Deepsea is guaranteed waterproof to a depth of 3,900 metres (12,800 feet).
The Rolex Deepsea benefits from the Ringlock system, a patented case architecture developed by Rolex. This system comprises three superposed elements: a thick, slightly domed sapphire crystal with an anti-reflective coating, a high-performance compression ring, which withstands the water pressure, and a case back in RLX titanium.